The objective of this study was to determine the prevalence of occupational asthma and sensitization to workplace allergens in greenhouse flower and/or ornamental plant growers. A random sample of 40 growers who cultivated such crops and had participated in the European Farmers' Study was selected for a cross-sectional study that included (1) greenhouse characteristics and air contaminants (dus...

A resistance monitoring program conducted for the polyphagous whitefly, Bemisia tabaci (Gennadius), in Imperial Valley, CA, USA generated a large set of LC50s for adults collected from broccoli, cantaloupe and cotton crops over a four-year period. A vial bioassay and, subsequently, a yellow-sticky card bioassay produced similar temporal profiles of relative susceptibilities to the pyrethroid in...

A simple CO2 control system was developed for a greenhouse with a high natural or forced ventilation rate. This CO2 control system maintains the difference in CO2 concentration between inside and outside the greenhouse, ∆C, during daytime being small (ca. 5 μmol mol), by supplying a variable amount of CO2 gas with time. Results showed that this system worked satisfactorily, while the CO2 concen...

the effects of agricultural information on the technical knowledge of the greenhouse owners in south khorasan province are dealt with in this study. research a descriptive-correlational methodology was ployed, and in terms of time, it was limited to the activities of the elements of knowledge and agricultural information as obtained from greenhouses during 2009. the study population consisted o...

Tomato is one of the main vegetable crops in Kuwait with a total greenhouse production of 39,218.3 tonnes and with a value of $ 9.58 million in 2004. Because of the country’s harsh climate, scarce water resources and poor-quality land resources, protected agriculture has a significant role in Kuwait’s agricultural development. Tomato is grown in 25% of total area under greenhouse crops and it p...

In a greenhouse system, a control is important to allow optimal growth conditions for crops. However, because testing the greenhouse for real conditions requires much time and money, the modeling-and-simulation approach is necessary to predict and improve the greenhouse environment. There is much research related to greenhouse control, there is a lack of research on applicable frameworks for re...

a recent study. The process uses a digester system with microorganisms to break down organic waste into fertiliser. The resultant fertiliser was used in a low-energy greenhouse to produce a range of food crops. The method is a potential way to utilise food waste and reduce the energy consumption of food production as part of a circular economy. New system to convert food waste into fertiliser f...

The greenhouse whitefly Trialeurodes vaporariorum (Hemiptera: Aleyrodidae) is a polyphagous pest in greenhouse crops. The efficacy of two entomopathogenic nematodes (EPN), Steinernema feltiae and Heterorhabditis bacteriophora, as biological control agents against T. vaporariorum was evaluated using two model crops typical of vegetable greenhouse productions: cucumber and pepper. Laboratory test...

Fungus gnats (Bradysia spp.) are major insect pests of greenhouse-grown horticultural crops mainly due to the direct feeding damage caused by the larvae, and the ability of larvae to transmit certain soil-borne plant pathogens. Currently, insecticides and biological control agents are being used successively to deal with fungus gnat populations in greenhouse production systems. However, these s...

Crop management depends on having the right information to make necessary decisions. Real-time monitoring of the greenhouse environment with sensors and advanced software can greatly improve yields and economic performance by optimizing plant growth. In this paper, we propose a system that can collect the information related to greenhouse environment and crop status and control the greenhouse a...